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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Jun. 30, 2014
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Intangible Assets [Line Items] |  |
Gross Carrying Amount, total intangible assets | $ 211,550 us-gaap_IntangibleAssetsGrossExcludingGoodwill | $ 213,550 us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization | (12,723)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (8,238)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net, total intangible assets | 198,827 us-gaap_IntangibleAssetsNetExcludingGoodwill | 205,312 us-gaap_IntangibleAssetsNetExcludingGoodwill
Gross Carrying Amount, non-amortizable intangible assets | 4,800 mygn_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill | 4,800 mygn_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization, non-amortizable intangible assets |  |
Net, non-amortizable intangible assets | 4,800 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 4,800 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Purchased Licenses And Technologies |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortizable intangible assets | 199,100 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember | 201,100 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember
Accumulated Amortization | (10,750)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember | (6,597)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember
Net, amortizable intangible assets | 188,350 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember | 194,503 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember
Customer Relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortizable intangible assets | 4,650 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 4,650 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization | (1,673)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (1,441)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net, amortizable intangible assets | 2,977 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 3,209 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Trademarks |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortizable intangible assets | 3,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember | 3,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember
Accumulated Amortization | (300)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember | (200)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember
Net, amortizable intangible assets | 2,700 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember | 2,800 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember
Total amortized intangible assets |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortizable intangible assets | 206,750 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember | 208,750 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember
Accumulated Amortization | (12,723)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember | (8,238)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember
Net, amortizable intangible assets | 194,027 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember | 200,512 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember
In-Process Research And Development |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, non-amortizable intangible assets | 4,800 mygn_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 4,800 mygn_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember
Accumulated Amortization, non-amortizable intangible assets |  |
Net, non-amortizable intangible assets | $ 4,800 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | $ 4,800 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember

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